[Click theon"forum"buttonof(toppage)]the[Go> to the "Settingpanelpersonalization"andtheat bottom theof(Ifpage it does not clickappear, the "SettingbuttonPersonalization")]And{set>"UseON internal engine"]search > [Submit].

2) canyou use searchthewindowsof from file forexplorer, the directory ".\app_data\forum\"

About the point (1):
The code openisThesource.ofpartcodethetheregardingusingsearch the internal isengine, the function "FunctionnomedofFindInTopic(...)"filethe app_code/ForumManager.vb (developers can thischangeimproveto the code)